jorgecarleitao edited a comment on pull request #389:
URL: https://github.com/apache/arrow-rs/pull/389#issuecomment-855365462
Isn't it possible to not offset the child data, and instead only offset the
`offsets`, or do we have some logic around that assumes that offsets always
start from 0?
In arrow2, I am doing
```rust
impl<O: Offset> ListArray<O> {
pub fn slice(&self, offset: usize, length: usize) -> Self {
let validity = self.validity.clone().map(|x| x.slice(offset,
length));
let offsets = self.offsets.clone().slice(offset, length + 1);
Self {
data_type: self.data_type.clone(),
offsets,
values: self.values.clone(),
validity,
offset: self.offset + offset,
}
}
}
```
note how the `offsets` are sliced and the values are cloned. The
`ListArray<O>::offset` is only used for compatibility with the C data interface.
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